tvOS 9.2.1tvOS 9.2.1 contains bug fixes and security improvements. The build number is 13Y5752a.In addition, a profile on the developer portal is available to update Apple TV to tvOS 9.2.1 Beta seeds. If you have tvOS 9.1 Beta 1 or Beta 2 currently installed, please use the available .ipsw file to install tvOS 9.2.1 Beta 1. More details are available under Installation Instructions.